Pavement breaker



April 28,1925; 1,535,411

c. c. HANSEN PAVEMENT BREAEEER Filed July 11, 1924 2 Sheets-Shet lINVENTOR mauled lflfansen BY I r I I H \& ATTORN April 28, 1925..

1,535,411 c. c. HANSEN PAVEMENT BREAKER E l s u y. 1, 1924 2Sheets-Sheet 2 INVENTOR i lfzalesallanden HIS ATTO EY Fatented Apr- 2 5-i PATENT OFFICE,-

CHARLES C. HANSEN, OF EASTON, PENNSYLF'ANIA, ASSIGNOR 1'0 INGEESOLI-BLND GQMPANY, F JERSEY CITY, NEW JERSEY, A.

CORPORATION OF NEW JERSEY.

' PAVEMENT BREAKER,

Application filed July 11,

To all whom it may concern: Y

Be it known that I, CHARLEs C. HANSEN,

a citizen of the United States, and a resident of Easton, in the countyof Northampton 5 and State of Pennsylvania, have inventeda certainPavement Breaker, of which the following is a specification, accompaniedby drawings.

This invention relates to pneumatically 10 operated pavement breakingmachines and more particularly to a machine designed for breakingpavement by prying it loose from the foundation to which it is attached.

The embodiment hereinafter described is more particularly adapted toremove layers of asphalt pavement and its object is to support apneumatically operated machine and provide controlling and adjustingdevices by whic the operator may conveniently direct/the breaking toolto. perform its work. l

The invention will be more clearly understood by reference to thefollowing description taken in conjunction with the accompanyingdrawing, in which- Figure 1 is a side elevation of a pavement breakerconstructed in accordance with the practice of the invention,

Figure 2 is a plan view of the machine,

for the handles to the supporting axle,

Figure 4-is a vertical longitudinal section of the pavement breaker, and

Figure 5 is a cross sectionthrough the 3 guide and percussive tool takenalon the line 5-5, looking in the direction 0 the arrows."

-Referring to the drawing, the machine comprises a vehicle which mayinclude an 40 axle A having a wheel B on either end and a pair ofrearwardly extending handles C and D by which the machine is guided, aguide E rotatably mounted on the axle A so as to be angularly adjustableand a per-' cussive tool F slidably mounted in the guide 7 E and adaptedto receive a shovel-like steel or bit G for operating against thepavement. Preferably at the rear of the uide E there is providedpneumatic fee means Figure 3 is a detail view of the connection 1924.swarm. 725,375.

' comprising a cylinder H bolted or otherwise attached to the guidewithin which a piston J is adapted to into the cylinder H and returnedby means of a coil spring K located between the piston and the cylinderhead L. The piston J 1s connected to cussive tool F by means .of apiston rod P working in the glandQ.

The gavement breaking machine F is prefera 1y of the hammer type'andmaybe specially designed to slide in the guide E or, if desired, astandard fluid actuated paving breaker may be adapted to the purpose byproviding a built-up cross-head R clamped about the tool as by means ofthe bolts S. The form of cross-headpmployed in this instance is shown inFigure 5 and comprises a pair of yokes R adapted to fit together and befastened by the bolts the back head 0 of the per reciprocate hein pushedforward by compressed air admitted S and arranged when placed togetherto fit tightly about a cylindrical portion of the tool F. Each of theyokes R is provided with a suitable projection T which slides in thegrooves U of the guide E. There are preferably at least two suchcross-heads;-

one on the forward end of'the machine and the other on the rear.

Adjustment of the inclination 'of the guide E to the rod surface may beobtained by means of a rod V which is pivotally' joined at the-rearwardend ofthe guide E as for-instance by means ofv a clevis W on the rod Vjoined by means of a pin Y to a boss Z .on the cyllnderi The rod V isadapted to be clamped: on a bracket I) mounted on a rod or tube 0extendin trans versely between the handles 0 and By loosening the boltsd the rear end of the guide E may be raised or lowered to secure theproper angle to the road. surface and upon tightening of the bolts toclamp the rod V th s angle may be maintained.

The machine as above described is preferably heavy so as to preventvibration and also to prevent the blows of the toolF from lifting thewheels from thegronnd. For

this reason trailer wheels 6 are provided, be

.ing mounted I on an axle f supported by brackets 9 extending downwardlyfrom the handles C and D. The handles C and D may be formed from pipebent to the desired shape as, for instance, shown in Figure 1 and whichare attached to the axle A (Figure 3) by means of a casting 72. adaptedto encircle the handles. A block j also fitting about the axle A isadapted with the bolts 79 to hold the axle and handle at right angles toeach other.

The handle C, which is formed from a pipe, forms a convenient means forconducting the compressed a1r to the pneumatic percussive tool F and thecylinder H. Accordingly, a flexible connectlon such as the hose 0 may beconnected with the handl 0 at any suitable point and "attached by meansof a suitable coupling to th'ecylinder H. At the forward end of thehandle C a flexible tube or hose p conducts compressed air to thepercussive tool F. The end of the handle C nearest the operatorsposition is adapted to be connected with a compressed air line 9provided with a conveniently located throttle valve 1*. No independentcontrolling valve need be provided for the feed cylinder H since, whilethe machine is in operation, the tool F should be fed up to the work. Inorder to prevent the steel or bit G trom'dropping out of the chuck ofthe tool when the latter is withdrawn, a suitable steel retainer 8 isprovided.

The operation of th machine will be understood from the abovedescription. The

operator first adjusts the inclination of the guide E with respect tothe pavement so that the bit G will undercut the pavement as shown at2?. By opening a throttle valve r compressed air is admitted to thepercussive tool F and simultaneously to the feed cylinder H. lhus, asthe machine drives the bit G under the pavementt the piston J holds themachine against the work. The operator may, at the same time, push themachine forward to advance the bit G. Upon closing the throttle valve7', the compressed air escapes from the cylinder H from the hose 0 andthe hose p into the tool F exhausting the air to atmosphere andpermitting the coil spring K to return the piston J and the tool F. I

In order to start a cut in the asphalt, the guide E may be positionedmore vertically by loosening the clamping bolts (1 to allow the rod V toslide upwardly on the clamp. In this position the bit G works nearlyperpendicular against the surface of the asphalt to cut down into itrather than to lift as in the operation above described.

I claim:

1. A pavement breaker comprising a vehicle, a. guide on said vehicle, apercussive machine slidably mounted in said guide, pneumatic feed meansfor thrusting said Lea er].

percussive machine forwardly and a spring for returning said percussivemachine to its normal inoperative position.

2. A pavement breaker comprising a vehicle, an axle, a pair of wheels, apair of rear- Wardly extending handles on said axle, a guide supportedby and rotatable on said axle and a pneumatic percussive machineslidably mounted in said guide.

3. A pavement breaker comprising an axle, a pair of wheels, a pair ofrearwardly extending handles on said axle, a guide supported by androtatable on said axle, a pneumatic percussive machine slidably mountedin said guide, and means for adjusting the inclination of said guide.

t. A pavement breaker comprising an axle, a pair of wheels, a pair ofrearwardly extending handles on said axle, a guide supported by androtatable on said axle, a pneumatic percussive machine mounted in saidguide, means for adjusting the inclination of said guide and means tofeed said percussive machine forwardly in said guide 5. A pavementbreaker comprising an axle, a pair of wheels, a pair of rearwardlyextending handles on said axle, a guide supported by and rotatable onsaid axle, apneumatic percussive machine slidably mounted in said guide,means for adjusting the inclination of said guide, means to feed saidpercussive machine forwardly in said guide, and means for including acylinder on said guide, a piston secured to said percussive machineadapted to be thrust forwardby fluid pressure and a spring arranged toreturn said piston.

6. A pavement breaker comprising an axle, a pair of wheels, a pair ofrearwardly extending handles on said axle, a guide supported by androtatable on said axle, a. pneumatic percussive machine slidably mountedin said guide and means for se curing said guide at a desiredinclination including a rod attached rearwardly on said guide andadapted to be clamped rigidly with respect to said handle.

7. A pavement breaker comprising an axle, a pair of wheels on'said axle,a pair of rearwardlyextending handles on said axle, a guide supported byand rotatable on said axle, a percussive machine slidably mounted insaid guide, a rod attached rearwardly on said guide and adapted to beclamped rigidly with respect to said handles, feeding means comprising acylinder on. said guide and a piston secured to said percussive machineadapted to be thrust forwardly by fluid pressure and a spring to returnsaid piston.

8. A pavement breaker comprising an axle, a pair of wheels on said axle,a pair of rearwardly extending handles on said axle, a guide supportedby and rotatable slida bly on said axle, a percussive machine slidablyw'ardlyby fluid ressure, a sprin to return mounted in said guide, a rodattached rearsaid piston, an supporting trailer wheels wardly on saidguidle and adapted L to be for said handles. v clamped rigidly withrespect to said han- In testimony whereof I have signed this 5 dies,feeding means comprising aeylinder spe lficatlonu i on said guide, apiston secured to aid per cussive machine adaptedte be thrust for-GHARLES 0. HANSEN.

